THE NERVOUS SYSTEM OF AMPHIBIA 



209 



ABBREVIATIONS 



Ad., areas of adhesion between spinal 

 cord and skin or mesoderm 



APDC, ascending process of the giant 

 ganglion cell 



Aud. v., auditor}' vesicle 



C, notochord 



CC, central canal of tlie spinal cord 



Com., commissural cell 



DC, giant ganglion cell 



DCF., peripheral fiber from the giant 

 ganglion cell 



Dor. LL., primordium of the dorsal 

 division of the lateral line 



DT., sensoi'y, or dorso-lateral tract, 

 arising from giant ganglion cells 



Ec. Th., ectoderm.'il thickenings con- 

 nected with the visceral pouches 



Inf. LL., primordium of the inferior 

 or ventral division of the lateral line 



LL., primordium of the lateral line 



M., myotome 



Md. LL., primordium of the mandibu- 

 lar line 



Mes., mesenchj'me 



-l/.s., muscle-sensory ending of giant 

 ganglion cell 



Opt. St., optic stalk, cut at the surface 

 of the brain 



Po. LL., postauditorj- lateral line pri- 

 mordium 



Pr. LL., preauditory lateral line pri- 

 mordium 



R. V, VII, etc., positions of the roots 

 of the corresponding cranial nerves 



S., spinal cord 



SG., anlage of the spinal ganglion 



Sub. LL., suborbital lateral line pri- 

 mordium 



Sup. LL., supraorbital lateral line pri- 

 mordium 



VC, motor cells, the cells of origin of 

 the motor, or ventro-lateral tract 



VT., motor, or ventro-lateral tract 



}'., yolk spherule 



Z., Cytoplasmic connectives between 

 the spinal cord and the skin. 



THE JOtlRNAI- OF COMPARATIVE NEUROI-OGT, VOL. 24, XO. 2 



